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Summary of Significant Accounting Policies Equity Ownership (Details)	Mar. 31, 2015
CenterPoint [Member]
Percentage Share of Management Rights	50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_CenterpointMember
OGE Energy [Member]
Percentage Share of Management Rights	50.00%oge_PercentageShareOfManagementRights / dei_LegalEntityAxis = oge_OgeEnergyMember

X

- Definition

Percentage Share of Management Rights

+ References

No definition available.

+ Details

Name:	oge_PercentageShareOfManagementRights
Namespace Prefix:	oge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=oge_CenterpointMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=oge_OgeEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: